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Physical Review B (Condensed Matter and Materials Physics)
Print Issue of 1 March 2002

Phys. Rev. B 65, 094417 (2002) (8 pages)

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Enhancement of the electronic contribution to the low-temperature specific heat of an Fe/Cr magnetic multilayer

B. Revaz, M.-C. Cyrille, B. L. Zink, Ivan K. Schuller, and F. Hellman
Department of Physics, University of California at San Diego, 9500 Gilman Dr, La Jolla, California 92093

(Received 5 September 2001; published 13 February 2002)

We measured the low-temperature specific heat of a sputtered (Fe23Å/Cr12Å)33 magnetic multilayer, as well as separate 1000 Å thick Fe and Cr films. Magnetoresistance and magnetization measurements on the multilayer demonstrated antiparallel coupling between the Fe layers. Using microcalorimeters made in our group, we measured the specific heat for 4<T<30  K and in magnetic fields up to 8 T for the multilayer. The low-temperature electronic specific heat coefficient of the multilayer in the temperature range 4<T<14  K is gammaML = 8.4  mJ/K2 mol. This is significantly larger than that measured for the Fe or Cr films (5.4 and 3.5 mJ/K2 mol, respectively). No magnetic field dependence of gammaML was observed up to 8 T. These results can be explained by a softening of the phonon modes observed in the same data and the presence of an Fe-Cr alloy phase at the interfaces. 75.70 (magnetic multilayer) and 75.40 (specific heat of magnetic materials). ©2002 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v65/e094417
doi:10.1103/PhysRevB.65.094417
PACS: 75.70.Cn, 75.40.Cx        Additional Information

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